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<p>This package provides the UI part for projection documents of which the most important part is the projection viewer. A projection  viewer
is a text viewer that allows to expand and collapse folded regions defined by a projection document. This package also introduces a projection
annotation model, projection annotations. The projection viewer offers support to show a summary for a folded region.
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<h2>Package Specification</h2>
<p><code>ProjectionViewer</code> is a specialized <code>SourceViewer</code> that can display line-based folding based on a <code>ProjectionDocument</code>. To
do this it uses supporting classes like <code>IProjectionListener</code>, <code>IProjectionPosition</code>, <code>ProjectionAnnotation</code> and others.
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